Water-tube boiler.



DJ 8. JA COBUS.

WATER TUBE BOILER. APPLICATION FILED MAR.10, 1914 1,1629% ratemedN isO; 1915 WITNESSES.

WW I v ATTORNEYJ.

DAVID s. JACOIBUS, F JERSEY crrY, NEW JERSEY, ASSIGNOR T0 BABcocK & WI cox COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

WATER-TUBE oILER.

To all whom it may concern:

Be it known that I, DAVID S. JAQOBUS, a

. citizen of the United States, residing at J ersey City, in the county of Hudson and State I .Boilers, of which the following is a specifi cation.

My invention relates to water tube boilers and has for its object an increase in the efiiciency and capacity in installations of large units. This is effected through a furnace arrangement in which exceptionally high efficiencies are obtained combined with a boiler for economically removing the heat generated in burning the fuel. In certain somewhat similar boilers which have been constructed, where there are three upper steam and water drums and two lower mud drums, there is a limitation to the amount of heating'surface which may be installed especially in designs contemplating the use of straight boiler tubes. The present inven tion overcomes this difiiculty and allows for the introduction of any amount of surface that could be desired to meet practical demands. The construction further admits of the introduction of dust pockets for collect- I vantage.

The invention comprises certain features I of construction which will be understood by reference to the accompanying drawing which is a vertical longitudinal section of aboiler showmg one embodiment of the invent1on.

In the design shown there are two inner banks of water tubes 1 and 2 inclined toward each other and expanded at their upper ends into a central steam and water drum 3, and at their lower ends 1nto mud drums 4 and 5, said latter drums extending parallel with lower ends expanded into headers 10 and 11.

The headers 8 and. 9, are connected by nip ples 12 and 13 with outer steam and water drums l4 and 15, respectively, and the lower Specification of Letters Patent. P t nt 30 5. Application filed March 10, 1914. Serial No. 823,651.

headers 10 and 11 are connected by nipples l6 and 17 with the mud drums 4 and 5,. respectively. Spaces'between the nipples 16 and 17 permit the dust to fall through into pockets as later described. The steam and water drums 14 and 15 are placed one on each side of the central steamand water drum and parallel therewith, and the central drum is inter-connected with the outer drums by steam circulators 18 and 19, and by water circulators 20 and 21.

Alternate tubes in the front rows of the outer banks of tubes are omitted so as to permit of the expansion into headers 10 and 11 of rows of tubes 22 and 23 expanded at their upper ends into the central steam and i Y water drum alternately with the water circulators 20 and 21. I also introduce rows of tubes 24 and 25, the former expanded into drum l4 and headers 10, and the latter into drum 15 and headers 11.

Baflies 26 and 27 are placed at the rear of the inner banks of tubes and extend upward from the mud drumsso as to direct the hot gases from the furnace to the upper part of 0 the two banks except where it is desired to secure a higher furnace temperature than would be secured by exposing all of the tubes of the inner banks to the fire, in which case the baffles 18 and 19 are placed between.

banks of tubes by baflies 28 and 29 supported on the rows of tubes 22 and 23, respectively. After entering the lower part of the outer banks of tubes the gases are madeto cross and recross the same by cross baffles 30 and 31, and to take a generalupward direction 9 by bafiies 32 and 33 supported upon the tubes 24 and 25, respectively. The gases finally pass to the stack connections through the damper openings'34 and 35. In this design the water and steam circulates upward through the tubes of the inner banks and the water from drum 3 flows into drums 14 and 15 through the circulators 20 and 21, thence downward through the tubes of the outer banks and the tubes 24 and 25, and 1 through the headers 10 and 11 and connecting nipples 16 and 17 into the mud drums 4e and 5, from whence it again flows upward through the tubes of the inner banks. The

steam generated by the boiler passes from the drums 1-1 and 15 through the pipes 36 and 37 to two superheaters 38 and 39 placed in the spaces at the rear of the inner banks into cross boxes. The superheaters may be, omitted 1f saturated steam only 1s requ red.

Dust pockets +2 and 43 are provided below the mud drums l and 5 into which dust will collect after passing through the spaces between the nipples 16 and 17, and from which pockets it may be withdrawn by any suitable means.

The tubes in the outer banks 6 and 7 may be readily removed, as indicated by the broken lines, bypassing tliem downward through hand hole openings in the headers '10 and 11 and new-tubes may be inserted by passing them upward throughthe headers. In the ordinary use of straight tubes conne'cted at both ends to drums it is necessary to allow for removal and replacement of any one of the tubes without removing the others, and to do this suflicient space is left he tweenthe tubes, and the spacing and the form of the projections'on the drums are' so arranged that after cutting out an old tube a new one can be inserted in its place. In inserting the new tube one end of it is passed through the opening in one of the drums and it is then moved over the open? ing in the other drum and made to enter the latter, after which it is expanded into place. To accomplish this requires a much wider spacing of the tubes than is required in boilers of the present design where the tubes are replaced in the outer banks by passing them upward through hand hole openings in the headers.

The hand hole fittings provided for th removal and replacement of tubes in the headers 10 and 11 need be removed only for replacing tubes, as it is not necessary to remove such fittings in cleaning the tubes by means of standard turbine tube cleaners, which are inserted from the top of the tubes. This removes an objection often raised'to the use of a number of such hand hole fittings.

The banks of tubes are suspended over a common furnace 4% extending from. the front to the rear of the boiler, the inner banks being so disposed as to converge to ward each other upwardly, their upper ends meeting approximately in the transverse central vertical plane of the setting. There is thus provided a large A-shaped combus- I tion chamber substantially closedat the apex and open to the gases at the upper part of the inclined sides; that is, at the ufitakc ends of the generating tubes of the inner banks. The gases divide and pass over the heating surfaces, as indicated by the arrows and as previously described.

The furnace may be of any approved type with means for charging it preferably at the front and rear, so as to provide a substantially continuous fuel bed beneath the boiler.

\Vith such arrangement the character of the combustion may be maintained substantially constant from one side of the boiler to the other, .and the loss often experienced through a stream or lane of excess air or unappears before the gases pass from the upper part of the combustion chainber, and, as thecomposition of the gases for uniform firing conditions will be substantially uniform from one side of the boiler to the other, it follows that the composition of the entire volume of the gases leaving the furnace will be substantially uniform.

The angle of inclination of the tubes of the heating surface is approximately 20 to the vertical, but I do not restrict myself to such degree of inclination, the essential feature being the disposition of the banks of tubes over a common'furnaceand combustion chamber to provide an A-shaped combustion chamber of relatively large volume, and the other features herein described,

which contribute to an increased efficiency tubes of said banks are expanded, two outer banks of tubes one on each side of the inner banks, upper and lower headers into which the tubes of the outer banks are expanded,

.outer steam and water drums, steamand Water circulators connecting the intermediatedrum with the outer drums, connections between said upper headers and the'outer steam and water drums, and connections between the lower headers'and the mud drums.

2. In a Water tube boiler, two inner banks of generating tubes inclined toward each other so as to form two sides of an A-shaped combustion chamber, a steam and water drum and two mud drums into which the tubes of said banks are expanded, two outer banks of tubes one on each side of the inner banks, upper and lower headers into which the tubes of the outer banks are expanded, outer steam and water drums, steam and water circulators connecting the intermediate drum with the outer drums, connections between said upper headers and the outer steam and water drums, connections between the lower headers and-the mud drums, and bafiies to direct the hot gases to the upper part of the inner banks of tubes, thence downward to the lower part of the outer banks, and thence upward over the tubes of the outer banks.

3. In a water tube boiler, two inner banks of generating tubes inclined towardeach other so as to form two sides of an A-shaped combustion chamber, a steam and water drum and two mud drums into which the tubes of said banks are expanded, two outer banks of tubes one oneach side of the inner}- .parts of the inner banks of tubes, bafiles extending downwardly-, from the intermediate steam and water drum to direct the gases to the lower part of the outer banks of tubes,

and baflies to direct the gases upwardly over the tubes ofthe outer banks.

4. In a water tube boiler, two inner banks of generating tubes inclined toward each other so as to form two sides of an A-sha'ped combustion chamber, a steam and water drumand two mud drums into which the tubes of said banks are expanded, two outer banks of tubes one on each side of the inner banks, upper and lower headers. into which the tubes of the outer banks are expanded, outer steam and water drums, steam and water circulators connecting the intermediate drum with the outer drums, connections be-.

tween said upper headers and the outer steam and water drums, connections between the lower headers and the mud drums, and pipes connecting the outer steam and water drums with said headers;

5. In a water tube boiler, twoinner banks of generating tubes inclined toward each other so as to form two sides of an A-shaped combustion chamber, a steam and water drum and two mud drums into which the tubes of said banks are expanded, two outer banks of tubes one on each side of the inner banks, upper and lower headers into which the tubes of the outer banks are expanded,

outer steam and waterdrums, steam and water circulators connecting the intermediate drum with the outer drums,j: connections between said upper headers and the outersteam and water drums, connections between the lower headers" and themud drums, and

rows of tubes connecting the intermediate steam and water drum with said headers.

'6. In a water tube boiler, two inner banks of generating tubes inclined toward each other so as to form two sides of an A shaped' combustion chamber, a steam and water drum and two mud drums into which the tubes of'said banks are expanded, two outer banks of tubes one on each side of the inner banks, upper and lower headers into which the tubes of the outerFbanksare expanded,

i ,outer steam and water drums, steam and water circulators connecting the intermediate drumwit h the outer drums, connections between said upper headers and the outer steam and water drums, connections between the lower headers and the mud drums, rows of tubes connecting the intermediatesteam. and water drum with said headers, baffles supported on said tubes, and bafiies to di rectt he'gases to the upper part of the inner banks of tubes.

7 In a water tube boiler, two inner banks of generating tubes inclined toward eachother so as to form two sides of an A-shaped combustion chamber, a steam and water drum and two mud drums into which the tubes of said banks are expanded,two outer banks of tubes one on each side of the inner banks, upper and lower headers into which the tubes of the outer banks are expanded, outer steam and water drums, steam and water circulators connecting the intermediate drum with the outer drums, connections between said upper headers and the outer steam and water drums, connections between the lower headers and the mud drums,

superheaters in the spaces between the in-":

ner and outer banks of tubes, and connec-- tions between the outer steam and water drums and said superheaters. I

In testimony whereof I have hereunto signed my name in thepresence of two subscribing witnesses.

. Davin s. JACOBUS. Witnesses E; P. TERRY, EDITH CAMP. 

